Question

The magnetic field at the center of a long circular coil carrying current will be :

• A. parabolic lines
• B. circular lines
• C. parallel straight lines
• D. perpendicular straight lines

Answer 1

The correct option is C parallel straight lines

The field at the centre of a long circular coil carrying current will be parallel straight lines. The similar situation is shown in the figure. You can use right hand rule to derive the direction of the field. One can think of a solenoid having only one turn.